Vol. 52.] SEISMIC PHENOMENA IN THE BRITISH EMPIRE. 665 



to ascribe to them the same stability as that which characterizes 

 the plains of Russia and Siberia. 



Records are at hand of 147 shocks in 69 localities distributed 

 over 3 regions. 



1. Valley of the St. Lawrence. 



S t =120 kilom. (1879-1888). S*=59 kilom. 

 (23 localities and 81 shocks.) 



This seismic region merely constitutes a narrow band along both 

 banks of the river, from the point where it issuos from Lake 

 Ontario down to Metis. 



2. Northern Shores of Lakes Erie and Ontario. 



^ = 163 kilom. (1877-1885). £ 2 *=^80 kilom. 

 (14 localities and 16 shocks.) 



This seismic region is also very narrow. Quinte Bay and the 

 isthmus between the two lakes appear to be the points of least 

 stability. 



3. Nova Scotia, New Brunswick, and Cape Breton. 



S x =278 kilom. (1847-1853, 1884-1886). £ 2 * = 137 kilom. 

 (13 localities and 13 shocks.) 



This region is bounded on the west by a conventional line drawn 

 from Xepisiguit Bay, and including the Bay of Fundy. 



§ 6. Scattered Possessions. 



1. Channel Islands, 



Here 12 shocks have been recorded from 3 localities. The islands 

 are often shaken by vibrations propagated from the neighbouring 

 French coast, and one may apply the seismicity of the latter to 

 them (£, = 171 kilom. ; £ 2 * = 84 kilom.). 



2. Gibraltar. 



The peninsula of Gibraltar belongs to a seismic region in Spanish 

 territory, whose seismicity is expressed by S 2 * = 102 kilom. Earth- 

 quakes are of common occurrence, because of the neighbourhood of 

 the very unstable region of Malaga. From the Gibraltar district 

 19 shocks have been recorded, and 2 from the Straits. 



